Power Systems
Which of the following transformer is used in sub station for operating a protective relay?

 capacitor voltage transformer
All of these
 auto transformer
 distribution transformer

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Power Systems
A sodium graphite reactors use

 a mixture of sodium and graphite as coolant.
 sodium as moderator and graphite as coolant.
  sodium as coolant and graphite as moderator.
 a mixture of sodium and graphite as moderator.

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Power Systems
In a biased differential relay the bias is defined as the ratio of

  operating coil current and restraining coil current.
  number of turns of restraining and operating coil.
  fault current and operating coil current.
  fault current and restraining coil current.

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